[feat] dynamically switch between light and dark theme

[fuchsi-fuchs]

This is an accessibility feature. People with different sight impairements prefer either light text on dark background - or the other way around. Seeing how this is a relatively simple theme this should be easy to implement?

There are two ways I see this done: either with a toggle in the header or footer, or - much better imho - by using css that reacts to the browsers preference setting (prefers-color-scheme media feature). It's probably possible to support both.

To have either solution would be great! This issue might be blocked by #10 though.

[mirus-ua]

Hello, I agree that this is a good idea, and both manual and auto theme switch can be implemented. On the other hand, it should be configurable from hugo.toml file, and the biggest blocker for this kind of implementation is to have all dark/light themes counterparts in the opposite tones.

The issue #10 can be rejected in favour of this approach